Tunnel-kiln fire box



March 20,` 1928. 1,662,912

n w. E. wlLsoN ET AL TUNNEL KILNA FIRE BOX Filed April 5, 1922 l' H, l|

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Patented Mar. 20, 1928.

UNITED STATES `WILLIAM E. WILSON, or MASON CITY, IOWA, AND HENRY aPoLIs, MINNESOTA.

l1,662,912 PATENT OFFICE.

e.V ruiniert,` or MINNE- V'.l!UNNELKILN FIRE BOX'.

playing into the fire box or furnace, trans versely from the side of the furnace or longitudinally along the aXis of the furnace, projected in from the lend of the furnace. There has also been an attempt to project the heating longitudinally along the top of the ware. Baile walls have been interposed between the flame and the ware to protect it from excessive heat and the theory has uniformly been to cause the heat to travel upward through the ware or longitudinally through the ware toward the spent gas outlet. Other kilns have been of the -mufle type, the combustion and products of cornbustion being confined in muilles and the heat transfer vmade by air circulating around the inutiles and through the ware.

In the present inventionA an entirely different theory of heat transfer is r'eliedupon. The ware is burned in a large open chamber and the flame which may be produced by gas, oil, or powdered fuel is projected upwards from a basement under the burning chamber. Among the objects,-therefore, of our invention are to provide newl mechanism for heat treating materials, more especially vApplication vkled April 5, 1922. Serial Nc.v 549,726.

In the drawingsannexed hereto and for-In-V ing a part hereof, n.

,Fig l is` a sectional plan view substantially along'the'plane indiact'edby the line l-l F ig. 3.

Fig. 2' is a sectional elevation substan- 'tially along the planeindicated by the line 2-2Figl. A

Fig. is atransverse sectional elevation substantially along the `plane indicated by l Referringy more in detail to thedrawing,

the burning chamber portion A of the kiln v isv here represented, showing vthe' cars of ware, Z), b', and so forth passing in con'tinu-y i ous procession through the furnace. `The car body has transverse ducts t communicat- Ingy with openings u in the car deck upon which the ware is stacked so that the heat may be forced Vdownwardly therethrough andY into the vsaid transverse ducts. The ware is usually set with vertical openings a: through. the same. `The products of combustion bythe action of the flame c and by the convection due to heatr rise to the roof ceiling y( of the burning chamberY and 'dropdown Athrough the ware, vdue to the cooling effect of the ware upon the'gases. They then pass into the car body and laterally through the openings al, d in the baffle walls c, c. The relatively cooler gases are reheated and re-circulated as will be obvious. It will be readily seenv that a continuous circulation is thus obtained first upwards in the burning chamber proper A, then along the roof, then downward through the ware b, b, and then laterally through the car body and baffle wall back into the burning chamber proper to be recirculated. This circulation will take place automatically due to they descending current inthe ware body, caused by the cooling of the gases in the ware, but in this invention it is augmented' by the vertical flanie e acting as an aspirator, tending to cause a pressure upwards inthe burning chamber Mproper and a lateral suction on the air passingthroughl the car body ,and the openings d, d. l

It will be noted that a series of flames are rcontemplated on 'either' side of the moving train of cars. The ldrawing shows' four onl either side, but there'may be a'greater or a lesser number. There are indicated balile walls, c and c', which are interposed be-` ware will "absorb `heat from the uniformly It is also contenir heated burning chamber. plated that the intensity of the flames along the lire box may be varied, the flames being independently controlled4 in .orderA tol Apro duce any desired heat curve in the burning chamber.. y The products f 0I". combustion may the withdrawn from the burning `chamber along.

thetunnels in either direction, or: partially in both directions ,longitudinally with l the ware.

Beneath the floor 'w of thekiln a chamber or basement B inwhich are located pipes p through which the fuel is-carried;

CQ Vbe -Cl i.SC-harged` through branches @finto nozzles alocated in..the..floor,1w.` ,Each` branch g may have any suitable .control` valve 7'. The fuel is `projected into the burning or firingchambers A,;where thefflames` occur as shown at e. {Either above or below thelloor w `are ducts f,- ff. whichfserveto carry heated'gasesV tothe fuelfan or `fans. during `the Aoperation thereof, said heated.

gases being drawnfrom theburning, chainber-Fthrough openings a. '.Inthis way a gradual-,forward `movement .of .the gases IEOLD 011e end towardgthe other of the kiln Vis produced@` Suitable damper. controlled air inlets s, may alsobe. provided at intervals inthe sidewalls m of thekilm 1 .It isof COurse understoodthat the specific description g o l structure and method set forth above may befdeparted fromwithout departing` Yromthe spirit of our invention as set-forth inthis speci-cation land the .appended claims. c i-Havingnowdescribed our invention, we claimcf. Tf. A, y.

1, A .kiln comprising a passage for the movement.,-,of were: .therethrough, :llame chambers at the sideof the passage. and having ,floorsA provided at. intervals with 4flame portsffuel supply means located beneath f saidlloors and having means for projecting burning fuelJupwardly through said ports and intoA said chambers, whereby the hot products of combustion i may pass upwardly.

to the top olifthe warezand downwardly therethrough, l V l 2.` kilnjcomprising a floor, walls and a ceiling, ,a horizontal partitionbetween said floor `and said ceiling and having ajport, meansi beneath said. partition for directin upwardly"through said port ahot blast, a track supported on `said floor, al movable support for Amaterial carriedfbyV said `track and having its upper' surface "above` said parti-1 tion,the`who`le, structure being adapted lto protect said `means and Ythe lowerportions of saidsupportfromthe'heat in the kiln',

3. A kiln comprisinga tunnel for the procession of cars and ware on the cars, flame chambersat the` side of the ttunnel, said chambers communicating at the lower and upper portions `with the upper kand lower portions of said tunnel whereby 1`ecirci1la tion ofhot gases may be eilectedV downward ly in the ware andupwardly-in the chambers, said chambers having floors provided with flame port-s at intervals, fuel conduits beneath said floors and having fuel projecting: means :for :projecting burning `fuel. iupwardly` .through `said ports. and Iinto said.i chambers.` .s f i w1 1;

4. `In. a j kiln, means `for directing a blast upwardly, a compartmentihaving a wall .ads jacentxto said. means, means. for deiiecting said blast downwardly :intosaid compartir ment, anda duct through said wallhaving a port opening toward, saidfmea-ns and another. port opening. into said compartment. ."l

5. In a kiln having a ceiling, means for4 directing a blastupwardly toward said ceilf ing, a support for material to be treated, ,a wallbetwcensaid means and saidsupport extending toward theceiling, a laterally ex' tending passage in said support.havingfilpfl ward and sideward openings, and a laterally extending duct in said Wall registrable.with,` said `sidewardopeningr and havingya `port;` opening toward said means.

6. In a kiln, means. for directing a'blast upwardly, a` supportffor materials` to` be: treated, a wall between said meansv and said` support, means fortleflecting -said blast` downwardlyioward said `supportnand"al duct throughsaid wall havinga port open-V ing toward said Vmeans and another iport ad-i jacent toA saidsupport., l q

7. In a kiln, means for directing ablast upwardly, asupportor material .to be treated, awall between said meansand said .Y support, `means for 4deflectingf` said blast" downwardly toward` said-support, Aa duet) through said wall having a` port opening to. ward saidmeans and a `second port-'fad` jacent to said support, and a passage in saidv support having airport registrable. with said second portland having another `portcom-` municating with the top ol saidsupport.y i

8. In a kiln, means for directing a blast upwardly, a support for materialto be treat. ed, a wall between said means and saidsupf-l port, means for delecting said blast down wardly toward said support,aduct ,through said wall having aport openingtoward saidmeans, and a second port adjacentto saidg support, and `means for establishing come* munication g between i said second .port and the uppersurface of said support.` i y p .9. In a kiln having al ceiling,y means for directing a blast upwardly toward said ceil-l ing, a compartment and asupportytherein for material lto be treated-fa Lwall of 'said compartment being disposed between said support and said means, and a duet through the aspirating action of the blast issuing said Wall having an opening near said means from said means. and another opening adjacent to said sup- In Witness whereof, We hereunto subscribe 10 port, the Whole being so adapted that the y our names to this specification.

blast deflected from said ceiling and descending to said support will be drawn through WM. E; WILSON. said duct and directed upwardly again by HENRY G. LYKKEN. 

